Anyone remember a Tia Lastania or new character? Some how name rings a bell somewhat...

Lastania is a country in the Union of Eastern Nations. To its north is the Demon Lord's Domain, and to its west - the Nothung Dragon Knight Kingdom.

Julius escaped there after his people turned against him and Amidonia was annexed.
The same country that Jirukoma (Komain's big brother) took his fellow refugees to become soldiers in the hopes of one day taking back their homeland.

We learn all this in Realist Hero, vol.5. (You can see Lastania on the map.)

As for Tia Lastania herself, doesn't take a genius to deduce she's the King's daughter. I don't think she was introduced in vol.5 though, so she is a new character.